Screening constant by unit nuclear charge calculations of resonance energies and widths of the 3pns 1,3P° and 3pnd 1P° Rydberg series of Mg-like (Z=13-26) ions

Resonance energies and total natural width of the 3pns 1P° and 3pnd 1P° Rydberg series of Mg-like (Z=13-26) ions are reported. Resonance energies of the Mg-like Al+ belonging to the 3pns 3P°→2p36pP1/202 and 3pns 3P°→2p36pP3/202 transitions are also tabulated. The calculations are made in the framework of the Screening constant by unit nuclear charge (SCUNC) formalism. Excellent agreements between experiments at ALS and R-matrix calculations are obtained for both 3pns 1,3P° and 3pnd 1P° Rydberg series of the Mg-like Al+ ions. The present results for Mg-like Si2+, S4+, Cl5+, and Ar6+, compared with the only existing R-matrix calculations indicate lack of accuracy in the Mg-like Si2+ data obtained from noniterative formulation of the eigenchannel R-matrix method. New precise data for Mg-like P3+, K7+, Ca8+, Sc9+, Ti10+, V11+, Cr12+, Mn13+, and Fe14+ ions are presented as useful guidelines for investigators focusing their challenge on the Photoionization of Mg-like heavy charged ions in connection with their application in laboratory, astrophysics, and plasma physics.